Tobacco curing furnace



Feb. 3, 1948. -J 5 M 5 ET AL 2,435,518

TOBACCO CURING FURNACE Filed Sept. 26, 1944 4 Sheets-Sheet 1 I 11 ventor:

Jb wv D. J/MPaa/v Cunzzzs M DHLI.

By M q Feb. 3, 1948.. SIMPSON- AL 2,435,518

TOBACCO CURING FURNACE Filed Sept. 26, 1944 4 Sheets-Sheet 2 I Mentor:

JbHN D. J/MPso/v CHAELE-S [TB/ML By fizmaaih 4 Sheets-Sheet 5 lmlentor CHfl/QLES 115:: 4

a Attorney;

J. D. SIMPSON ET AL TOBACCO CURING FURNACE Filed Sept. 26, 1944 Feb. 3, 1948.

Feb 1948- v J. D. SIMPSON ET AL 2,435,518

TOBACCO CURING FURNACE Filed Sept. 26, 1944 4 Sheets-Sheet 4 Inventors JBHN .Z). J/MAw/v (CHARLES MBA/.1.

By @M Patented Feb. 3, 1948 TOBACCO CURING FURNACE John D. Simpson and Charles M. Ball, Mount Airy, N. 0.

Application September 28,1944, Serial No. 555,845

2 Claims.

This invention relates to new and useful improvements in the art of tobacco curing and more particularly to a specially constructed furnace for producing heat in the process of curing tobacco.

The principal object of the present invention is to provide a simple yet thoroughly eillcient furnace for installation in tobacco barns, said furnace being constructed in such a manner as to be more durable and furnish a, more even distribution of heat than is now possible through the use of present-day tobacco curing furnaces.

The present invention contemplates a furnace provided with an arrangement of flues carrying smoke from the furnace and in this manner distributing heat uniformly and also allowing for a direct passage of dry heat from the furnace proper for the purpose of preventing any sweating and splotching of the tobacco being cured.

:Other important objects and advantages of the invention will become apparent to the reader of the following description. l

In the drawings Figure 1 represents a top plan view of the flue pipe arrangement.

Figure 2 is a fragmentary vertical sectional view through the structure shown in Figure 1.

Figure 3 is a fragmentary end elevational view of the barn shown in section in Figure 2, but having a portion broken away to disclose the furnace and flues.

Figure 4 is a longitudinal vertical sectional view through the furnace.

Figure 5 is a transverse vertical sectional view taken substantially on the line 5-5 of Figure 4.

Figure 6 is a transverse sectional view taken substantially on the line 6-6 of Figure 4.

Referring to the drawings wherein like numerals designate like arts, it can be seen that the present invention embodies two main factors, namely, a flue arrangement generally referred to by numeral 5 and a special furnace construction generally referred to by numeral 6.

The furnace embodies a base structure consisting of side walls I, 1, a front wall 8 and an ash door 9 in said wall 8, the wall 8 representing the lower portion of a main front wall It].

Longitudinally extending angle members i I, l I are riveted or bolted as at l2 to the upper edge portions of the side walls 1, l and the horizontal portions of these angle bars ll serve to support an elongated grate I3, this grate being removably disposed on the bars I l as suggested in Figure 6.

The furnace has an outer shell M which embodies side walls, a, a and a curved top b. The

flanged portions 16 of the front wall In and a rear wall H, the rear wall I! at its lower portion having a flue attachable neck It.

Numeral I! generally refers to an inner shell which is divided transversely and longitudinally into a plurality of sections. The upper edges of the sections are grooved as at 20 and these grooved portions are disposed against an elon gated tie rod 2|. The grooved portions of the sections of the inner shell I! have ears 200. which are bolted together as at 22, thus clamping the grooved portions of the sections against the tie rod 2|. 1

The side portions of the sections of the inner shell l9 are preferably formed with inwardly pressed portions 23 to permit expansion and-con traction of this shell structure.

At the rear end of the interior of the furnace is a short floor structure 24 which has a down wardly and arcuate shaped intermediate offset 25' so that smoke from the furnace can pass downwardly and out through the neck l8 to the flue pipe 35. The offset portion 25 of thebottom 24 has a slotted lug 26 through which a bolt or the like 21 can be disposed through the rear wall l'l, for holding this short bottom structure in definite position.

I An upstanding deflector plate 28 is provided at the forward end of the offset bottom 24, and

a baffle plate 29 is suitably secured in spaced relation to the back wall I! so that the heat of the furnace fire carried by the outblowing smoke and products of combustion will not unduly heat the rear wall.

It can now be seen that the front wall In in addition to having the ash door 9, has a door 30 through which coal can be shoveled on to the shell I4 is secured by bolts or rivets ii to the grate or on to the fire bed.

Further, that portion of the front wall Ill between the inner shell I! and the outer shell ll has openings 3| therein to allow air to pass into the chamber 32 between said shells.

The rear wall I1 is likewise formed with openings 33, it being preferable that the openings 33 be somewhat higher than the openings 3| in the wall 10. It can now be seen, that air can enter the furnace through the wall 10 by way of the openings 3|, from the outside of the barn A and pass along the chamber 32 where it is heated to a dry state and this dry heat can pass through the openings 33 in the rear wall l1 and directly pass into the barn, this dry heat serving principally to prevent any squirting or splotching of the tobacco being cured.

The fine arrangement 5 consists of a pipe 35 extending from the flue collar 18 and this has a pair of branch pipes 36, 36 extending laterally therefrom to join with parallel pipes 31, 31 which extend backwardly toward the furnace and have inwardly disposed pipe extensions 38, 38 meeting a common conduit 39 just over the furnace 6 which extend to a vertical flue or chimney 40, at the outside of the barn-A. This arrangement of the fiue p'p'es oiiers-zanauniform application oi heat to the-c'ontents otthe barn- L J While the foregoing specification sets forth the invention in specific terms, it is to be under-:, as; stood that numerous changes in the, shape, size and materials may be resorted to without departing from the spirit and scopeof .theginventionas claimed hereinafter.

Having described the invention,., what.is claimed,

as new is:

1. A furnace for tobacco curing comprisingjanj outer shell, a spaced inner shell, end walls, said shells being spaced fromeach other, openings inthe end walls to permit ingress-and egress of air, a grate in the inner shell, a downwardly off: set bottom at one end of the grate and: a flue attaching structure at the ofisetbottom, said inner shell comprising lateral. sections, joined attheir top along a vertical, longitudinal plane, a longitudinally extending, tubular recess formed in the adjacent surfaces, of'saidlateral sections, said lateral sections constituting a plurality of longiau st a s r r on el c in joint a s between said portions, and tension meansdisposed in said'tubular recess for aligning and seeuring in compression,said portions, and clamping means for securingsaidlateral sections upon 35 said-tension means. g 2. Apparatus for applying heat for tobacco curing by both radiation and convection, comprisins, afurnacehavingarear wall, a combustion chamben anoutlet for combustion products at the. rear of said combustion, chamber, a detach- Number Name I Y Date 292,537 7 Condit Jan. 29, 1884 742,146 Badger Oct. 27, 1903 742,147 1 Badger Oct. 27, 1903 900,384" Kaiser Oct. 6, 1908 1,449,324 Johnson vMar. 20, 1923 9 1,563,312 Muse i Nov. 24, 1925 able, downwardly ofiset bottom between said combustion chamber and said outlet, means comprising a conduit system connected to said outlet for disseminating heat from said furnace by radiation, and means for disseminating heat from I tending tie rod, disposed in the said longitudinal 20 vertical plane for securing the sections in longitudinal, axial alignment, said air jackets comprising; a plurality-off abutting, transverse sec,- tions; alignedaxially-of said furnace, the abut: ting ends of said sections. constituting telescopic joints. J r

-" JOH D. SIMP ON.

BALL- I 1 "itarnnnncns orrEn 'The following references are of record in the file of this patent: I I I 1 STATES PATENTS Smith Nov. 30, 1 926 

